taster

1. N-COUNT A taster is someone whose job is to taste different wines, teas, or other foods or drinks, in order to test their quality. 品嘗師; 試味員

...a wine taster. ...一名品酒師。

2. N-COUNT If you refer to something as a taster of something greater, or of something that will come later, you mean that it gives you an idea what that thing is like, and often makes you interested in it or want more of it. 樣品; 試用品[usu sing, oft N 'of' n]

The book is essentially a taster for those unfamiliar with the subject. 這本書基本上是讓那些不熟悉該學科的人對其有個初步的了解。